Local Law 97: What NYC Building Owners Need to Know About Carbon Penalties

What Local Law 97 Requires

Local Law 97, enacted as part of NYC's Climate Mobilization Act in 2019, established carbon emissions limits for most buildings over 25,000 square feet in New York City. The law aims to reduce citywide building emissions by 40% by 2030 and 80% by 2050, making it one of the most ambitious building emissions regulations in the world.

The law covers approximately 50,000 buildings — roughly 60% of NYC's total building square footage. Each covered building receives an emissions limit based on its occupancy type and size. Buildings exceeding their limit face annual penalties.

Emissions Limits and Penalty Structure

Emissions limits are set in two phases:

• 2024–2029: Initial limits are relatively generous — designed to capture the highest-emitting buildings. Approximately 20% of covered buildings are expected to exceed their limits in this phase.
• 2030–2034: Significantly stricter limits that will affect the majority of covered buildings. Most buildings will need to have completed efficiency upgrades by this point to avoid penalties.

The penalty rate is $268 per metric ton of CO2 equivalent over the building's limit. This is assessed annually based on the building's reported emissions for the prior calendar year. For large buildings, these penalties can be substantial — a midsize office building exceeding its limit by 500 metric tons faces a $134,000 annual penalty.

How Emissions Are Calculated

Building emissions are calculated from two sources:

• Direct emissions: On-site fuel combustion — natural gas, fuel oil, propane — used for heating, hot water, and cooking. These are the building owner's direct responsibility.
• Indirect emissions: Electricity consumption, which carries an emissions coefficient based on the carbon intensity of NYC's electrical grid. As the grid gets cleaner over time, the electricity coefficient decreases — which means buildings that electrify their systems benefit from a declining emissions factor.

Building owners must report their annual emissions through the city's portal, building on the energy benchmarking data already required under Local Law 84.

Strategies for Compliance

• Building envelope improvements: Insulation upgrades, window replacement, and air sealing reduce heating demand and are among the most cost-effective measures.
• HVAC system upgrades: High-efficiency boilers, heat pumps, and building management systems can significantly reduce fuel consumption.
• Electrification: Converting from fossil fuel heating to electric heat pumps reduces direct emissions and takes advantage of the declining grid emissions coefficient.
• Renewable energy: On-site solar installations and renewable energy credits can offset a portion of a building's emissions.
• Operational improvements: Optimizing building management systems, improving tenant behavior, and implementing energy-efficient lighting and equipment.

Exemptions and Special Cases

Several building types receive exemptions or modified requirements:

• Houses of worship
• Rent-regulated housing with certain affordability restrictions (partial exemptions)
• City-owned properties (separate compliance schedule)
• Buildings currently undergoing major capital improvements may qualify for temporary compliance adjustments

Connection to Other Compliance Requirements

Local Law 97 is part of a broader compliance ecosystem that includes Local Law 84 (energy benchmarking), Local Law 87 (energy audits and retro-commissioning), and Local Law 88 (lighting upgrades and sub-metering). Building owners subject to LL97 should ensure they're current on all related requirements, as non-compliance with benchmarking obligations can compound LL97 exposure.

Search your property at clerkside.com to see your full violation picture across all agencies, including any emissions-related compliance items. Call (617) 415-8731 for violation resolution support.